imagine ... a man knocking at your door wants to sell you a mixer or something else and tells you - this one has twice much google hits like all the others together ... would you buy it therefore?

But they already do. Number Google hits is a measure of how well-known something is. I was talking to a guy from car insurance company with the aim to get a better rate. However, he offered me a rate higher than I was paying to my current insurer. Nevertheless he tried to persuade me that I still should switch, because his company is better known.